Here is a list of things that affect battery life on the iPhone 3Gs. Click on each linked list item and we'll show you how to get to manipulate the setting.
- Push notifications
- Fetch data
- Push mail
- WiFi
- Bluetooth
- Check fewer mail accounts
- Minimize use of third-party applications
- Use Airplane mode
- Brightness
- EQ - iPod equaliser setting
- 3G
Applications that actively use location services such as Maps may reduce battery life.
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Some applications use the Apple Push Notification Service to alert you of new data. Those applications that extensively rely on push notifications (such as instant messaging applications) will impact battery life.
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Applications such as Mail can be set to fetch data wirelessly at specific intervals. The more frequently email or other data is fetched, the quicker your battery may drain. Also, the more mail accounts you have set up, the more power your iPhone uses to connect.
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If you have a push mail account such as Yahoo!, MobileMe or Microsoft Exchange, turn off push when you don’t need it.The question you have to ask yourself is whether you want to be interupted by constant mail notifications or whether it is just as convenient to look and download your mail as and when you want it.
If the global Fetch setting is set to "Manually", you will not be able to locate your iPhone using the MobileMe Find My iPhone feature.
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If you rarely use Wi-Fi, you can turn it off to save power. J33PER has WiFi on at all times.
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If you rarely use a Bluetooth headset or car kit, you can turn off Bluetooth to save power.
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Auto-check fewer email accounts
You can save power by checking fewer email accounts. This can be accomplished by turning off an email account or by deleting it. To turn off an account, go to Settings > Mail, Contacts, Calendars, choose an email account, and set Account to Off. To remove an account, go to Settings > Mail, Contacts, Calendars, choose an email account, and tap Delete Account.
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Minimize use of third-party applications
Excessive use of applications such as games that prevent the screen from dimming or shutting off or applications that use location services can reduce battery life.
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Minimize use of third-party applications
Use Airplane Mode in low- or no-coverage areas. Because your iPhone always tries to maintain a connection with the cellular network, it may use more power in low- or no-coverage areas. Turning on Airplane Mode can increase battery life in these situations; however, you will be unable to make or receive calls. To turn on Airplane Mode, go to Settings and set Airplane Mode to On.
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Adjust brightness
Dimming the screen is another way to extend battery life. Go to Settings > Brightness and drag the slider to the left to lower the default screen brightness. In addition, turning on Auto-Brightness allows the screen to adjust its brightness based on current lighting conditions. Go to Settings > Brightness and set Auto-Brightness to On.
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Turn off EQ
Applying an equalizer setting to song playback on your iPhone can decrease battery life. To turn EQ off, go to Settings > iPod > EQ and tap Off. Note that if you’ve added EQ to songs directly in iTunes, you’ll need to set EQ on iPhone to Flat in order to have the same effect as Off because iPhone keeps your iTunes settings intact. Go to Settings > iPod > EQ and tap Flat.
Turn off 3G
Using 3G cellular networks loads data faster, but may also decrease battery life, especially in areas with limited 3G coverage. To disable 3G, from the Home screen choose Settings > General > Network and set Enable 3G to Off. You will still be able to make and receive calls and access cellular data networks via EDGE or GPRS where available.
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